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java.lang.NullPointerException: 	at oracle.bali.xml.gui.jdev.overviewEditor.AbstractOverviewEditorXmlGui.handleShown(AbstractOverviewEditorXmlGui.java:191)	at oracle.bali.xml.gui.XmlGui.shown(XmlGui.java:156)	at oracle.bali.xml.gui.jdev.AbstractAsynchronousXmlVisualEditor.shownImpl(AbstractAsynchronousXmlVisualEditor.java:416)	at oracle.bali.xml.gui.jdev.StandardAsynchronousXmlVisualEditor.shownImpl(StandardAsynchronousXmlVisualEditor.java:125)	at oracle.ide.editor.AsynchronousEditor.editorShown(AsynchronousEditor.java:172)	at com.oracle.jdeveloper.nbwindowsystem.editor.SplitPane.riseEditorShown(SplitPane.java:1914)	at com.oracle.jdeveloper.nbwindowsystem.NbEditorContainer.componentShowing(NbEditorContainer.java:500)	at org.openide.windows.WindowManager.componentShowing(WindowManager.java:339)	at org.netbeans.core.windows.WindowManagerImpl.componentShowing(WindowManagerImpl.java:1191)	at org.netbeans.core.windows.view.DefaultView.changeGUI(DefaultView.java:168)	at org.netbeans.core.windows.ViewRequestor.dispatchRequest(ViewRequestor.java:275)	at org.netbeans.core.windows.ViewRequestor.processRequest(ViewRequestor.java:251)	at org.netbeans.core.windows.ViewRequestor.postRequest(ViewRequestor.java:189)	at org.netbeans.core.windows.ViewRequestor.scheduleRequest(ViewRequestor.java:127)	at org.netbeans.core.windows.Central.removeModeTopComponent(Central.java:1018)	at org.netbeans.core.windows.Central.userClosedTopComponent(Central.java:2032)	at org.netbeans.core.windows.view.DefaultView.userClosedTopComponent(DefaultView.java:794)	at org.netbeans.core.windows.view.ui.TabbedHandler.actionPerformed(TabbedHandler.java:337)	at org.netbeans.swing.tabcontrol.TabbedContainer.postActionEvent(TabbedContainer.java:730)	at org.netbeans.swing.tabcontrol.TabbedContainerUI.shouldPerformAction(TabbedContainerUI.java:165)	at org.netbeans.swing.tabcontrol.plaf.DefaultTabbedContainerUI.access$2700(DefaultTabbedContainerUI.java:112)	at org.netbeans.swing.tabcontrol.plaf.DefaultTabbedContainerUI$DisplayerActionListener.actionPerformed(DefaultTabbedContainerUI.java:1285)	at org.netbeans.swing.tabcontrol.TabDisplayer.postActionEvent(TabDisplayer.java:612)	at org.netbeans.swing.tabcontrol.TabDisplayerUI.shouldPerformAction(TabDisplayerUI.java:193)	at org.netbeans.swing.tabcontrol.plaf.BasicTabDisplayerUI.access$1700(BasicTabDisplayerUI.java:121)	at org.netbeans.swing.tabcontrol.plaf.BasicTabDisplayerUI$BasicDisplayerMouseListener.performCommand(BasicTabDisplayerUI.java:782)	at org.netbeans.swing.tabcontrol.plaf.BasicTabDisplayerUI$BasicDisplayerMouseListener.potentialCommand(BasicTabDisplayerUI.java:767)	at org.netbeans.swing.tabcontrol.plaf.BasicTabDisplayerUI$BasicDisplayerMouseListener.mouseReleased(BasicTabDisplayerUI.java:816)	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)	at java.awt.Component.processMouseEvent(Component.java:6535)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)	at java.awt.Component.processEvent(Component.java:6300)	at java.awt.Container.processEvent(Container.java:2236)	at java.awt.Component.dispatchEventImpl(Component.java:4891)	at java.awt.Container.dispatchEventImpl(Container.java:2294)	at java.awt.Component.dispatchEvent(Component.java:4713)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)	at java.awt.Container.dispatchEventImpl(Container.java:2280)	at java.awt.Window.dispatchEventImpl(Window.java:2750)	at java.awt.Component.dispatchEvent(Component.java:4713)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)	at java.awt.EventQueue$4.run(EventQueue.java:731)	at java.awt.EventQueue$4.run(EventQueue.java:729)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)	at oracle.javatools.internal.ui.EventQueueWrapper._dispatchEvent(EventQueueWrapper.java:169)	at oracle.javatools.internal.ui.EventQueueWrapper.dispatchEvent(EventQueueWrapper.java:151)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)